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  <title>Use snapshot mode for the query</title>

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</div><hr /><div id="mongocursor.snapshot" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">MongoCursor::snapshot</h1>
  <p class="verinfo">(PECL mongo &gt;=0.9.4)</p><p class="refpurpose"><span class="refname">MongoCursor::snapshot</span> &mdash; <span class="dc-title">Use snapshot mode for the query</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-mongocursor.snapshot-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type"><a href="class.mongocursor.html" class="type MongoCursor">MongoCursor</a></span> <span class="methodname"><strong>MongoCursor::snapshot</strong></span>
    ( <span class="methodparam">void</span>
   )</div>

  <p class="para rdfs-comment">
   Use snapshot mode for the query.  Snapshot mode assures no duplicates are returned, 
   or objects missed, which were present at both the start and end of the query&#039;s 
   execution (if an object is new during the query, or deleted during the query, it 
   may or may not be returned, even with snapshot mode).
  </p>
  <p class="para">
   Note that short query responses (less than 1MB) are always effectively snapshotted.
  </p>
  <p class="para">
   Currently, snapshot mode may not be used with sorting or explicit hints.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-mongocursor.snapshot-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>
 

 <div class="refsect1 returnvalues" id="refsect1-mongocursor.snapshot-returnvalues">
  <h3 class="title">返回值</h3>  
  <p class="para">
   Returns this cursor.
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-mongocursor.snapshot-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   Throws <a href="class.mongocursorexception.html" class="classname">MongoCursorException</a> if this cursor has started iterating.
  </p>
 </div>

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